13400663 has 4 divisors (see below), whose sum is σ = 13620408. Its totient is φ = 13180920.

The previous prime is 13400657. The next prime is 13400689. The reversal of 13400663 is 36600431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36600431 = 7 ⋅5228633.

It is a cyclic number.

It is not a de Polignac number, because 13400663 - 2¹² = 13396567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13400633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109781 + ... + 109902.

It is an arithmetic number, because the mean of its divisors is an integer number (3405102).

Almost surely, 2^13400663 is an apocalyptic number.

13400663 is a deficient number, since it is larger than the sum of its proper divisors (219745).

13400663 is an equidigital number, since it uses as much as digits as its factorization.

13400663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219744.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 13400663 is about 3660.6916013234. The cubic root of 13400663 is about 237.5246910618.

The spelling of 13400663 in words is "thirteen million, four hundred thousand, six hundred sixty-three".